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How to Use ASP.NET Identity for Custom Authentication in SharePoint Server 2019

Huma Ashraf Ch Oct 22, 2026 868 views

Question details

Replacing legacy ASP.NET Membership with ASP.NET Identity for forms-based authentication in an on-premises SharePoint environment.

Using ASP.NET Identity for Custom Authentication in SharePoint Server 2019

Product: SharePoint Server 2019
Device & OS: not provided
Scenario: Configuring custom or forms-based authentication on a local server environment.
Observed behavior: Seeking proper guidance or resources to implement the modern ASP.NET Identity framework instead of the legacy Membership provider.

Before you start

Ensure you have administrative access to your SharePoint Server 2019 Central Administration and understand the foundational differences between claims-based authentication and legacy membership models.

Solution 1Recommended

Consult the Microsoft SharePoint Server ITPro Forum

Because this involves complex on-premises configuration that differs significantly from SharePoint Online, reaching out to specialized SharePoint engineers is the recommended approach.

SharePoint Server 2019 inherently supports claims-based authentication. However, integrating a custom ASP.NET Identity provider requires specific web.config modifications, claims provider configurations, and IIS application pool adjustments that are highly specific to your local farm topology.

Navigate to Microsoft Q&A

Open your web browser and go to the official Microsoft Q&A topics page for SharePoint Server ITPro (https://learn.microsoft.com/en-us/answers/topics/office-sharepoint-server-itpro.html).

Create a detailed post

Click to ask a question and explain your current setup, including your SharePoint Server 2019 farm details and your specific goals with replacing ASP.NET Membership with ASP.NET Identity.

Monitor for expert responses

Microsoft engineers and specialized community members monitor these specific tags to provide guidance on custom authentication deployments.

Consult the Microsoft SharePoint Server ITPro Forum

Why this is necessary: SharePoint Server 2019 requires unique configuration steps for forms-based authentication. Using the dedicated ITPro forum ensures you receive assistance tailored to on-premises limitations and supported architectures.

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Frequently Asked Questions

Can I use ASP.NET Identity out-of-the-box with SharePoint Server 2019?

SharePoint Server 2019 natively supports Claims-based authentication out of the box. However, directly integrating modern ASP.NET Identity requires custom development, building custom claims providers, and executing specific web.config modifications across your web applications.

Is ASP.NET Membership completely deprecated in SharePoint 2019?

While Microsoft highly encourages modern authentication methods (such as SAML and OIDC integrations), legacy ASP.NET Membership can still technically be configured for forms-based authentication. However, transitioning to ASP.NET Identity is often preferred for new, secure custom implementations.

Where can I find official documentation for SharePoint forms-based authentication?

Official and technical documentation is available on the Microsoft Learn platform. Searching for 'SharePoint Server forms-based authentication' will provide configuration guides for adjusting IIS and Central Administration settings.

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